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# CCDC Algorithm developed for Continuous Change Detection and Classification (CCDC) of land cover using all available Landsat data. Please contact Zhe Zhu (zhe.zhu@ttu.edu) at Department of Geosciences, Texas Tech University if you have any questions. CCDC Software is available online now! The Most Recent 13.01 CCDC Software for Change Detection software is [here](https://drive.google.com/file/d/1XxTM2gmpe3hHGxfpXVPLbmUZC40nLzpK/view?usp=sharing). It would work both for Analysis Ready Data and Collection 1 data. It would only work for *** bits Linux machine. The Classification software is not provided at the moment, as it required training data to run the software. CCDC Assistor 1.0 beta is also available at [here](https://drive.google.com/drive/folders/1iZmKlSNjJtb6DkinyOiPJtfT74YCE_eF), which is a user interface tool for assisting in data preparation and map extraction for CCDC (more functions are on the way). Note that the output from CCDC will be thousands of Matlab files that contains all sorts of information for each time serie models as follows: 1. "t_start": when the time series model gets started 2. "t_end": when the time series model gets ended 3. "t_break": when the first break (change) is observed 4. "coefs": the coefficients for each time series model for each spectral band 5. "rmse": the RMSE for each time series model for each spectral band 6. "pos": the position of each time series model (location) 7. "change_prob": the probability of a pixel that have undergone change (between 0 and 100) 8. "num_obs": the number of "good" observations used for model estimation 9. "category": the quality of the model estimation (what model is used, what process is used) 10. "magnitude": the magnitude of change (difference between model prediction and observation for each spectral band) You need to extract those information from thousand of Matlab file to generate change maps or used as input for change detection. How to use the code: 1. Install Matlab Runtime Compilier version 8.1 for Linux ***-bit [here](http://ssd.mathworks.com/supportfiles/downloads/R2017b/deployment_files/R2017b/installers/glnxa***/MCR_R2017b_glnxa***_installer.zip) 2. Download all available Landsat CDR data from [espa](https://espa.cr.usgs.gov/) and put them into BIP ENVI format. This including stacking spectral bands in sequence of Blue, Green, Red, NIR, SWIR1, SWIR2, TIR, Fmask. Each image is in its sub-folders. Sample data can be downloaded [here](https://drive.google.com/drive/folders/1RerfMXpTrIOaZ_RG14MQlDnvFZZ4UBg2?usp=sharing). 3. CD to the image folder where all the images are saved in each individual subfolder. If your CCDC software is save in this location /zhezhu/ccdc/, you can just type /zhezhu/ccdc/CCDC_ChangeARD13_01 1 1 to Run the standalone sotware on one core. Extra instructions: If you want to run on N cores, you will need to write script to submit job to each individual core by CCDC_ChangeARD13_01 i n (i=1,2,3...n; where n is the total number of cores, and i is which core to run the current job). CCDC is extremly computational expensive. Please use as many cores as you can on your Linux clusters. The computing time for one line of ARD data (5,000 pixels) takes around 1 hours for 1 core (CCDC process line-by-line). CCDC default parameters are 0.99 change probability, 6 consecutive observations, and a maximum of 8 coefficients for time series models. If you want to specify your parameters, you just need to create a .txt file named 'CCDC_Parameters.txt' within the images folder, in which the first variable specify change probability, the second specify number of consecutive days, and the last variable is the maximum number of coefficients (can be 4, 6, or 8), such as 0.95 5 6. Please cite the following papers paper 1: Zhu, Z. and Woodcock, C. E., Continuous monitoring of forest disturbance using all available Landsat imagery, Remote Sensing of Environment (2012), doi:10.1016/j.rse.2011.10.030.(paper for CCDC version 1.0.) paper 2: Zhu, Z. and Woodcock, C. E., Continuous change detection and classification of land cover using all available Landsat data, Remote Sensing of Environment (2014), doi.org/10.1016/j.rse.2014.01.011.(paper for CCDC version 7.3.) paper 3: Zhu, Z., Woodcock, C. E., Holden, C., and Yang, Z., Generating synthetic Landsat images based on all available Landsat data: Predicting Landsat surface reflectance at any given time, Remote Sensing of Environment (2015), doi.org/10.1016/j.rse.2015.02.009.(paper for CCDC version 11.4.) This algorithm has been applied to many parts of the world and you can see all located where it has been applied [here](https://github.com/bullocke/Landsat-Database/blob/master/PRmap.geojson) You can download the PPT with GIF images that explain the CCDC algorithm at this [link](https://www.dropbox.com/s/1jzfte8mjy4qzzr/CCDC_algorithm_intro.pptx?dl=0)

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